上标打印字体自动变粗

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RichTextBox rtbsup = new RichTextBox();
         rtbsup.Font = new Font("宋体", 12F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((byte)(134)));
         rtbsup.SelectedText = "测试文本" + "右上角";
         rtbsup.SelectionStart = "测试文本".Length;
         rtbsup.SelectionLength = "右上角".Length;
         rtbsup.SelectionCharOffset = 5;

         FarPoint.Win.Spread.CellType.RichTextCellType rtct = new FarPoint.Win.Spread.CellType.RichTextCellType();
         this.fpSpread1_Sheet1.Cells[0, 0].CellType = rtct;
         this.fpSpread1_Sheet1.Cells[0, 0].Value = rtbsup.Rtf;

         this.fpSpread1_Sheet1.Cells[0, 1].Value = "正常文本信息";
         fpSpread1.PrintSheet(-1);  // 打印

  通过该方法设置文本显示在右上角，科室打印出来后，字体自动变粗体？